org.apache.beam.sdk.values

Interface POutput

All Known Subinterfaces:

PCollectionView<T>, PValue

All Known Implementing Classes:

PCollection, PCollectionList, PCollectionTuple, PCollectionViews.SimplePCollectionView, PDone, PValueBase, SpannerWriteResult, WithFailures.Result, WriteFilesResult, WriteResult

public interface POutput

The interface for things that might be output from a PTransform.

Method Summary

Modifier and Type	Method and Description
java.util.Map<TupleTag<?>,PValue>	expand() Expands this POutput into a list of its component output PValues.
void	finishSpecifyingOutput(java.lang.String transformName, PInput input, PTransform<?,?> transform) As part of applying the producing PTransform, finalizes this output to make it ready for being used as an input and for running.
Pipeline	getPipeline() Returns the owning Pipeline of this POutput.

Method Detail

getPipeline

Pipeline getPipeline()

Returns the owning Pipeline of this POutput.

expand

java.util.Map<TupleTag<?>,PValue> expand()

Expands this POutput into a list of its component output PValues.

• A PValue expands to itself.
• A tuple or list of PValues (such as PCollectionTuple or PCollectionList) expands to its component PValue PValues.

Not intended to be invoked directly by user code.

finishSpecifyingOutput

void finishSpecifyingOutput(java.lang.String transformName,
                            PInput input,
                            PTransform<?,?> transform)

As part of applying the producing PTransform, finalizes this output to make it ready for being used as an input and for running.

This includes ensuring that all PCollections have Coders specified or defaulted.

Automatically invoked whenever this POutput is output, after finishSpecifyingOutput(String, PInput, PTransform) has been called on each component PValue returned by expand().